A harmful lichen is

Umbilicaria

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Letharia

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Usnea

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Cladonia

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Solution

The correct option is B Letharia
Letharia vulpina is toxic to mammals due to the yellow pigment vulpinic acid.
It has been used historically as a poison for wolves and foxes. Hence, A harmful lichen is Letharia.
So, the correct answer is "Letharia'.

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